2. Use an intensive treatment weekly.These products "contain humectants like panthenol, which get deep into the hair shaft and trap moisture to plump individual strands," says Frauke Neuser, PhD, a scientist for Procter & Gamble. Massaging them in stimulates the circulation of blood to the scalp while cleansing and exfoliating it, keeping locks healthy and helping them grow, says Elizabeth Cunnane Phillips, a New York-based trichologist (hair health specialist) at the Philip Kingsley Clinic.

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